An apparatus is described for the measurement of the velocity of light in air and transparent media. The apparatus uses solid-state light-emitting and detecting diodes, and can be constructed for about Pounds 25. With the aid of a single-beam oscilloscope and a two meter optical bench, results accurate to better than 1% can be obtained. This accuracy is shown to be sufficient for an experimental verification of the relationship between the group and phase velocities of light in a dispersive transparent medium.
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Reagan Barr (1972) studied this question.
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